<template>
    <div>
        <div class="search">
            <input v-model='keyword' class="search-input" type="text" placeholder="输入城市名或拼音">
        </div>
        <div class="search-content border-bottom" ref='search' v-show='keyword'>
            <ul>
                <li 
                    class="search-item  border-bottom" 
                    v-for='item of list' 
                    :key='item.id'
                    @click='handleCityClick(item.name)'
                >{{item.name}}</li>
                <li class="search-item  border-bottom"  v-show='hasNoData'>没有找到匹配数据</li>
            </ul>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapMutations } from 'vuex'
export default {
    name: 'CitySearch',
    props: {
        cities: Object
    },
    data(){
        return {
            list: [],
            keyword: '',
            timer: null
        }
    },
    methods: {
        handleCityClick(city){
            //数据简单的时候可以省略dispatch此步,直接使用commit
            // this.$store.commit('changeCity', city)
            // 使用mapMutations简化
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    computed: {
        hasNoData(){
            return !this.list.length
        }
    },
    watch: {
        keyword(){
            if(this.timer){
                clearTimeout(this.timer)
            }
            if(!this.keyword){
                this.list = []
                return 
            }
            this.timer = setTimeout(() => {
                const result = [];
                for(let i in this.cities){
                    this.cities[i].forEach( (value) => {
                        if(value.spell.indexOf(this.keyword) > -1 || value.name.indexOf(this.keyword) > -1){
                            result.push(value)
                        }
                    })
                }
                this.list = result  
            },300)
        }
    },
    mounted(){
        this.scroll = new Bscroll(this.$refs.search)
    }
}
</script>

<style lang="stylus" scoped>
    @import '~style/varibles.styl'

    *
        touch-action:pan-y
    .search
        height: .72rem
        background: $bgColor
        padding: 0 .1rem
        .search-input
            box-sizing:border-box
            width: 100%
            height: .62rem
            border-radius: .06rem
            text-align: center
            color: #666
            padding: 0 .1rem
    .search-content
        z-index: 1
        position: absolute
        top: 1.58rem
        left: 0
        right: 0
        bottom: 0
        background: #eee
        .search-item
            line-height: .62rem
            padding-left: .24rem
            color: #666
            background: #fff
</style>